211402591391777 has 2 divisors, whose sum is σ = 211402591391778. Its totient is φ = 211402591391776.

The previous prime is 211402591391731. The next prime is 211402591391807. The reversal of 211402591391777 is 777193195204112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201680642447761 + 9721948944016 = 14201431^2 + 3118004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211402591391777 is a prime.

It is not a weakly prime, because it can be changed into another prime (211402591390777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105701295695888 + 105701295695889.

It is an arithmetic number, because the mean of its divisors is an integer number (105701295695889).

Almost surely, 2^{211402591391777} is an apocalyptic number.

It is an amenable number.

211402591391777 is a deficient number, since it is larger than the sum of its proper divisors (1).

211402591391777 is an equidigital number, since it uses as much as digits as its factorization.

211402591391777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6667920, while the sum is 59.

The spelling of 211402591391777 in words is "two hundred eleven trillion, four hundred two billion, five hundred ninety-one million, three hundred ninety-one thousand, seven hundred seventy-seven".